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Dear Student, 
Please find below the solution to the asked query:

fx=1+xa1+2xb111+xa1+2xb1+2xb11+xaConstant term will be obtained by putting x=0f0=1+0a1+0b111+0a1+0b1+0b11+0af0=111111111As all three rows are samef0=0Hence optionsa,c,d are incorrect.Optionb is correct.

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